DC transformer based on cascaded DAB structure
A DC transformer and DC conversion technology, which is applied in the direction of DC power input conversion to DC power output, instrumentation, and electrical variable adjustment. It can solve problems such as topology limitations, reduce current stress, facilitate rapid recovery, and ensure safety and reliability. running effect
Active Publication Date: 2020-06-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0006] Aiming at the defects of the prior art, the purpose of the present invention is to provide a DC transformer based on the cascaded DAB structure, which aims to solve the problem in the prior art that only partial redundant functions can be realized due to the limitation of the topology
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0026] The technical problem to be solved by the present invention is to overcome the defect that the existing DC transformer based on the cascaded DAB structure cannot realize the full redundancy function, and the failure of some semiconductor switches causes the system to shut down, and proposes an improved DC transformer based on the cascaded DAB structure. In this way, the full redundancy function for internal and external faults is realized, and the reliability of the operation of the DC transformer is improved.
[0027] Such as Figure 4 As shown, a DC transformer based on a cascaded DAB str...
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The invention discloses a DC transformer based on a cascaded DAB structure. The transformer comprises n identical DC conversion sub-modules SM1, SM2,... SMn; a high-voltage side first connecting terminal T1 of the first DC conversion sub-module SM1 is connected with a positive electrode of a high-voltage DC side through a DC inductor L1; the high-voltage side second connecting terminal T2 of the i-th DC conversion sub-module SMi is connected with the high-voltage side first connecting terminal T1 of the (i+1)-th DC conversion sub-module SMi + 1, and the high-voltage side second connecting terminal T2 of the n-th DC conversion sub-module SMn is connected with the negative electrode of the high-voltage DC side; and the low-voltage side third connecting terminals T3 of the n DC conversion sub-modules SM1, SM2,... SMn are connected with the positive electrode of the low-voltage DC side. Through the coordination control of the semiconductor switches on the input side, when any part of a certain DC conversion sub-module in the system breaks down, the faulted sub-module can be bypassed rapidly, the full-redundancy function is achieved, and safe and reliable operation of the DC transformeris guaranteed.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a DC transformer based on a cascaded DAB structure. Background technique [0002] With the development of power electronic control technology and device manufacturing technology, compared with the AC grid, the DC grid has achieved technical and economic advantages in many fields. Especially with the increasing demand for grid-connected distributed new energy and the wide application of DC loads, DC power grid is the trend of power development in the future. [0003] In order to realize the voltage conversion and power management of high and low voltage DC grids, DC transformers, as an important part of DC grids, have received extensive attention. The cascaded DC transformer based on Dual Active Full Bridge (DAB) is a hotspot of current research. It is composed of multiple DAB sub-modules cascaded, the high-voltage side is connected in series, and the l...
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IPC IPC(8): H02M3/335
CPCH02M3/33584
Inventor 田杰王丹毛承雄官志涛邬玮晗
Owner HUAZHONG UNIV OF SCI & TECH